<script setup>
import { User, Lock } from '@element-plus/icons-vue'
import { ref } from 'vue'//数据
import { ElMessage } from 'element-plus'//警告框
import { useRouter } from 'vue-router'
const router = useRouter();

//控制注册与登录表单的显示， 默认显示注册
const isRegister = ref(false)
//用于身份选择
const options = [
  {
    value: '0',
    label: '学生',
  },
  {
    value: '1',
    label: '老师',
  }]
//用于注册的数据模型
const registerData = ref({
    username: '',
    password: '',
    rePassword: '',
    identity:''
})
//用于登录数据模型
const loginData = ref({
    username: '',
    password: '',
    identity:''
})
//自定义确认密码的校验函数
const rePasswordValid = (rule, value, callback) => {
    if (value == null || value === '') {
        return callback(new Error('请再次确认密码'))
    }
    if (registerData.password !== value) {
        return callback(new Error('两次输入密码不一致'))
    }
}
//用于注册的表单校验模型、登录表单验证
const rules = ref({
    username: [
        { required: true, message: '请输入用户名', trigger: 'blur' },
        { min: 5, max: 16, message: '用户名的长度必须为5~16位', trigger: 'blur' }
    ],
    password: [
        { required: true, message: '请输入密码', trigger: 'blur' },
        { min: 5, max: 16, message: '密码长度必须为5~16位', trigger: 'blur' }
    ],
    rePassword: [
        { validator: rePasswordValid, trigger: 'blur' }
    ]
})

//调用后台接口,完成注册
import { userLoginService} from '@/api/login.js'
//导入token状态
import { useTokenStore } from '@/stores/token.js'
//绑定数据,复用注册表单的数据模型
//表单数据校验
//登录函数

//调用useTokenStore得到状态
const tokenStore = useTokenStore();
const login =async ()=>{
    //调用接口,完成登录
   let result =  await userLoginService(loginData.value);
   
    //保存token
    
    tokenStore.setToken(result.data)
    ElMessage.success('登陆成功');
    router.push('/');
}
//用于清除登录数据模型
const clearLoginData=()=>{
    loginData.value={
        username:'',
        password:'',
        identity:''
    }
}

//用于清除注册登录模型
const clearRegisterData=()=>{
    registerData.value={
        username:'',
        password:'',
        rePassword:''
    }
}
</script>
<template>
    <el-row class="login-page">
        <el-col :span="12" class="bg"></el-col>
        <el-col :span="6" :offset="3" class="form">
            <!-- 注册表单 -->
            <el-form ref="form" size="large" autocomplete="off" v-if="isRegister" :model="registerData" :rules="rules">
                <el-form-item>
                    <h1>注册</h1>
                </el-form-item>
                <el-form-item prop="username">
                    <el-input :prefix-icon="User" placeholder="请输入用户名" v-model="registerData.username"></el-input>
                </el-form-item>
                <el-form-item prop="password">
                    <el-input :prefix-icon="Lock" type="password" placeholder="请输入密码" 
                    v-model="registerData.password"></el-input>
                </el-form-item>
                <el-form-item prop="rePassword">
                    <el-input :prefix-icon="Lock" type="password" placeholder="请输入再次密码" 
                    v-model="registerData.rePassword"></el-input>
                </el-form-item>
                <!-- 注册按钮 -->
                <el-form-item>
                    <el-button class="button" type="primary" auto-insert-space>
                        注册
                    </el-button>
                </el-form-item>
                <!-- 返回时清除登陆数据模型 -->
                <el-form-item class="flex">
                    <el-link type="info" :underline="false" @click="isRegister = false;clearLoginData()" >
                        ← 返回
                    </el-link>
                </el-form-item>
            </el-form>
            <!-- 登录表单 -->
            <el-form ref="form" size="large" autocomplete="off" v-else :model="loginData" :rules="rules">
                <el-form-item>
                    <h1>登录</h1>
                </el-form-item>
                <el-form-item prop="username">
                    <el-input :prefix-icon="User" placeholder="请输入用户名" 
                     v-model="loginData.username"></el-input>
                </el-form-item>
                <el-form-item prop="password">
                    <el-input name="password" :prefix-icon="Lock" type="password" placeholder="请输入密码" 
                    v-model="loginData.password"></el-input>
                </el-form-item>
                <!-- 身份选择 -->
                <el-form-item>
                    <el-select v-model="loginData.identity" class="m-2" placeholder="请选择登录身份" size="large">
                        <el-option
                          v-for="item in options"
                          :key="item.value"
                          :label="item.label"
                          :value="item.value"
                        />
                    </el-select>
                </el-form-item>
                <el-form-item class="flex">
                    <div class="flex">
                        <el-checkbox>记住我</el-checkbox>
                        <el-link type="primary" :underline="false">忘记密码？</el-link>
                    </div>
                </el-form-item>
                <!-- 登录按钮 -->
                <el-form-item>
                    <el-button class="button" type="primary" auto-insert-space @click="login">登录</el-button>
                </el-form-item>
                <!-- 点击注册时清除注册数据模型 -->
                <el-form-item class="flex">
                    <el-link type="info" :underline="false" @click="isRegister = true;clearRegisterData()">
                        注册 →
                    </el-link>
                </el-form-item>
            </el-form>
        </el-col>
    </el-row>
</template>
<style lang="scss" scoped>
/* 样式 */
.login-page {
    height: 100vh;
    background-color: #fff;

    .bg {
        background: url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
            url('@/assets/login_bg.jpg') no-repeat center / cover;
        border-radius: 0 20px 20px 0;
    }

    .form {
        display: flex;
        flex-direction: column;
        justify-content: center;
        user-select: none;

        .title {
            margin: 0 auto;
        }

        .button {
            width: 100%;
        }

        .flex {
            width: 100%;
            display: flex;
            justify-content: space-between;
        }
    }
}
</style>